feat: refactor shift pattern with atomic rephase and swipeable calendar

班次设置页重构与体验增强:

数据模型重构:
- phaseBreaks + override 两独立字段 → 原子 RephaseFlip(date, flippedTo, rephaseFrom)
- 解决幽灵重排/撤销误删/断点链不级联三大问题

体验改进:
- 角标颜色按类别配对(onPrimary/onError/onTertiary)
- 迷你月历动态行数(复用 getMonthGridInfo)
- 恢复默认改 Snackbar 撤销(首次引入 SnackbarHost)
- 锚点日期与周期行右侧对齐修复
- 点击年月标题弹 DatePicker 选月份跳转
- HorizontalPager 滑动翻月 + 高度插值平滑过渡

.zcode/plans/plan-sess_ace6e49c-6557-47c4-9e42-2b0bbfd83e00.md

@@ -0,0 +1,137 @@
+## 目标
+
+修复班次设置页的 6 个问题:
+1. 长按撤销误删巧合重合的独立断点
+2. 长按产生的 override 与 phaseBreak 解耦,单独点翻转留幽灵重排
+3. 连续长按产生断点链,撤销老断点不级联
+4. `kindAt` 每格每次重组重算(无 remember 缓存)
+5. "恢复默认"无撤销,立即落盘
+6. 角标颜色硬编码 `onPrimary`、固定 6 行
+
+根因:问题 1-3 都是"长按产生的 override + phaseBreak 是两个独立数据,但语义上是原子操作"。彻底解法是重构数据模型。
+
+## 总体方案
+
+**引入 `RephaseFlip` 原子结构**,把"翻转某天 + 从次日起重排"绑定成一个不可分割的数据单元。`overrides`(纯单日翻转)和 `phaseBreaks` 两字段保留,但长按操作改为产出 `RephaseFlip` 而非拆成两个独立字段。
+
+### 新数据模型
+
+```kotlin
+// 新增:原子化的"翻转并重排"操作记录
+data class RephaseFlip(
+    val date: LocalDate,        // 被翻转的天
+    val flippedTo: ShiftKind,   // 翻转后的值
+    val rephaseFrom: LocalDate  // 重排起点(= date + 1)
+)
+
+data class ShiftPattern(
+    val anchorDate: LocalDate,
+    val cycle: List<ShiftKind>,
+    val overrides: Map<LocalDate, ShiftKind> = emptyMap(),  // 保留:纯单日翻转(点)
+    val rephaseFlips: List<RephaseFlip> = emptyList(),      // 新增:翻转并重排(长按)
+    val name: String = "默认"
+) {
+    fun kindAt(date: LocalDate): ShiftKind? {
+        if (cycle.isEmpty()) return null
+        // 1. 纯单日翻转优先
+        overrides[date]?.let { return it }
+        // 2. rephaseFlips 中被翻转的当天
+        rephaseFlips.find { it.date == date }?.let { return it.flippedTo }
+        // 3. 找活跃锚点:rephaseFlips 的 rephaseFrom <= 当天 的最大那个;无则基础锚点
+        val (anchor, offset) = activeAnchor(date)
+        ...
+    }
+}
+```
+
+**关键变化**:
+- `phaseBreaks` 字段**删除**,替换为 `rephaseFlips`
+- `activeAnchor` 改为从 `rephaseFlips` 取 `rephaseFrom` 作锚点
+- kindAt 优先级:overrides → rephaseFlip 当天 → 活跃锚点 cycle
+
+**撤销语义变干净**:长按 7/10 产生 `RephaseFlip(7/10, OFF, 7/11)`。再次长按 7/10 → 按 `date == 7/10` 精确匹配整个原子记录删除,**不会误删**别的(解决问题 1)。单独点 7/10 翻转时,如果存在 `rephaseFlip.date == 7/10`,提示或阻止(解决问题 2)。
+
+### 存储格式
+
+App 未正式发布(git 历史显示个人项目,SharedPreferences 刚引入)。**不做向后兼容迁移**:
+- 存储格式改:`KEY_BREAKS` → `KEY_REPHASE`,编码 `日期:flippedTo:rephaseFrom`(`1/0:ISO日期`)
+- 旧数据(含 `KEY_BREAKS` 的)在 `load()` 时解析 `KEY_REPHASE` 失败返回 null → 回退 `DEFAULT_PATTERN`(load 已有 try/catch)
+- 用户唯一数据是默认 2班2休,丢失无感知
+
+### 测试策略(先建安全网)
+
+**Task 0 优先**:在改模型前,先用端到端测试锁定当前所有行为(kindAt 的全部输出),确保重构后这些断言仍然成立。新增针对长按场景(翻转+重排、撤销、连续长按)的测试,先在旧模型上跑过(记录当前行为),再重构后验证不回归。
+
+## 实施步骤(7 个 Task,TDD)
+
+### Task 0: 建立测试安全网(不改产品代码)
+
+在改任何产品代码前,补充测试覆盖当前行为,作为重构的回归基线:
+- `ShiftPatternTest`:补充"长按翻转+重排"端到端断言(用 override+phaseBreak 组合模拟当前长按产出,断言后续序列)。包括:单次长按、连续两次长按、撤销场景。
+- `ShiftPatternStorageTest`:补充往返测试覆盖 phaseBreak。
+- 这些测试在旧模型上**必须先通过**,记录为"重构前行为"。
+
+### Task 1: 重构 ShiftPattern 数据模型(RephaseFlip)
+
+- 新增 `RephaseFlip` data class
+- `ShiftPattern` 删除 `phaseBreaks`,加 `rephaseFlips: List<RephaseFlip>`
+- 重写 `kindAt`:overrides → rephaseFlip 当天 → 活跃锚点(从 rephaseFlips.rephaseFrom 取)
+- 重写 `activeAnchor`:从 `rephaseFlips` 取 `rephaseFrom <= date` 的最大
+- 删除 `PhaseBreak` 类
+- **所有 Task 0 测试必须通过**(行为不变)
+- 补充新测试:rephaseFlip 撤销精确匹配、多个 rephaseFlip 共存
+
+### Task 2: 重构 ShiftPatternStorage 存储格式
+
+- `KEY_BREAKS` → `KEY_REPHASE`
+- save/load 改为序列化 `rephaseFlips`(`日期:flippedTo:rephaseFrom`)
+- `parseRephase` 替代 `parseBreaks`
+- 往返测试更新
+
+### Task 3: 重写 ShiftCalendarGrid 交互逻辑
+
+- `toggleFlipAndRephase`:产出 `RephaseFlip(date, flippedTo, date+1)`,撤销按 `date` 精确匹配
+- `togglePhaseBreak` 删除
+- `toggleOverride` 加保护:若该天存在 rephaseFlip,移除整个 rephaseFlip(防止幽灵重排,解决问题 2)
+- 角标 `isRephaseStart` 改为检测 `rephaseFlips.any { it.rephaseFrom == date }`
+- ShiftDayCell 加 `remember(pattern, date) { pattern.kindAt(date) }` 缓存(解决问题 4)
+
+### Task 4: 修复角标颜色(问题 6)
+
+- 角标文字色按类别:班=`onPrimary`、休=`onError`、起=`onTertiary`
+- 对齐 DayCell 风格:9sp、TopEnd、CircleShape 胶囊背景
+
+### Task 5: 修复固定行数(问题 7)
+
+- `ShiftCalendarGrid` 改用 `getMonthGridInfo(viewYear, viewMonth).rows` 动态算行数
+- 删除硬编码 `(0 until 6)`,改为 `(0 until rows)`
+
+### Task 6: "恢复默认"加撤销(问题 5)
+
+- 引入 `SnackbarHost`(项目首次使用,需在 Scaffold 加 `snackbarHost` 参数)
+- 点恢复默认 → 存旧 pattern 到临时变量 → 显示 Snackbar "已恢复默认,撤销" 5 秒
+- 点撤销 → 恢复旧 pattern
+- 不再用 AlertDialog 确认(Snackbar 撤销比确认对话框更现代,且防误操作)
+
+### Task 7: 全量验证
+
+- `./gradlew :app:assembleDebug :core:testDebugUnitTest` 通过
+- `./gradlew spotlessApply`
+- 手动验证清单(模拟器):长按翻转重排、再次长按撤销、连续长按、恢复默认撤销
+
+## 改动文件清单
+
+| 文件 | Task | 改动 |
+|------|------|------|
+| `core/.../ShiftPattern.kt` | 1 | 删 PhaseBreak,加 RephaseFlip,重写 kindAt |
+| `core/.../ShiftPatternStorage.kt` | 2 | 存储格式改 |
+| `core/.../ui/ShiftCalendarGrid.kt` | 3,4,5 | 交互逻辑+角标颜色+动态行数 |
+| `core/.../ui/ShiftPatternScreen.kt` | 6 | Snackbar 撤销 |
+| `core/test/.../ShiftPatternTest.kt` | 0,1 | 安全网+重构后验证 |
+| `core/test/.../ShiftPatternStorageTest.kt` | 0,2 | 往返测试更新 |
+
+## 风险
+
+- **kindAt 行为变化**:`rephaseFlips` 的 `rephaseFrom` 与旧 `phaseBreaks.date` 在"长按场景"下语义等价(都是次日),但"纯 phaseBreak"(offset!=0)不再支持。当前 UI 不产生 offset!=0 的断点(长按总是 offset=0),所以无实际影响。Task 0 测试会验证。
+- **存储不兼容**:旧 `KEY_BREAKS` 数据被忽略,用户重置为默认。已确认可接受(个人项目,数据可重建)。
+- **Snackbar 首次引入**:需确认 Material3 Scaffold 的 snackbarHost 用法正确,不破坏现有布局。

core/src/main/kotlin/plus/rua/project/ShiftPattern.kt

@@ -9,55 +9,67 @@ import kotlinx.datetime.daysUntil
 enum class ShiftKind { WORK, OFF }
 
 /**
- * 相位断点:从 [date] 起重排周期相位,[cycleOffset] 指定当天对应 cycle 的第几位。
+ * "翻转并重排"的原子记录:翻转 [date] 当天为 [flippedTo],
+ * 并从 [rephaseFrom] 起重排周期相位(后续按 cycle 重新顺延)。
  *
- * @param date 断点生效日(含当天)
- * @param cycleOffset 该天对应的 cycle 索引(0 = cycle[0])
+ * date 与 rephaseFrom 通常相邻(rephaseFrom = date 的次日),
+ * 作为单一操作的两面绑定存储,撤销时整体删除,不会留下孤立数据。
+ *
+ * @param date 被翻转的天
+ * @param flippedTo 翻转后的班次
+ * @param rephaseFrom 重排起点(含当天),该天起按 cycle[0] 重新循环
  */
-data class PhaseBreak(
+data class RephaseFlip(
     val date: LocalDate,
-    val cycleOffset: Int
+    val flippedTo: ShiftKind,
+    val rephaseFrom: LocalDate
 )
 
 /**
  * 个人轮班周期。
  *
  * 与法定节假日完全独立。某天的班/休由以下顺序决定:
- * 1. 若 [overrides] 命中该天,取 override 值(单日翻转);
- * 2. 否则取该天"活跃锚点"(最近的 phaseBreak 或基础 anchorDate)起算的 cycle 索引。
+ * 1. 若 [overrides] 命中该天,取 override 值(单日翻转,仅当天);
+ * 2. 否则若 [rephaseFlips] 中有该天作为翻转日的记录,取 [RephaseFlip.flippedTo];
+ * 3. 否则取该天"活跃锚点"(最近的 rephaseFlips.rephaseFrom 或基础 anchorDate)
+ *    起算的 cycle 索引。
  *
  * @param anchorDate 基础周期基准日,对应 cycle[0]
  * @param cycle 一个周期内的班次序列,例如 [WORK, WORK, OFF, OFF] 表示 "2 班 2 休"
- * @param overrides 单日翻转映射(调班),key 为日期
- * @param phaseBreaks 相位断点列表,从某天起重排周期相位
+ * @param overrides 单日翻转映射(仅当天,不影响后续),key 为日期
+ * @param rephaseFlips 翻转并重排记录列表;每条翻转某天并从次日起重排周期
  * @param name 方案名
  */
 data class ShiftPattern(
     val anchorDate: LocalDate,
     val cycle: List<ShiftKind>,
     val overrides: Map<LocalDate, ShiftKind> = emptyMap(),
-    val phaseBreaks: List<PhaseBreak> = emptyList(),
+    val rephaseFlips: List<RephaseFlip> = emptyList(),
     val name: String = "默认"
 ) {
     /**
-     * 返回 [date] 当天的班次。优先级:overrides → 活跃锚点的 cycle 索引。
+     * 返回 [date] 当天的班次。优先级:overrides → rephaseFlip 当天 → 活跃锚点的 cycle 索引。
      * cycle 为空时返回 null。
      */
     fun kindAt(date: LocalDate): ShiftKind? {
         if (cycle.isEmpty()) return null
-        // 1. 单日翻转优先
+        // 1. 单日翻转优先(仅当天)
         overrides[date]?.let { return it }
-        // 2. 找活跃锚点:phaseBreaks 中 date <= 当天 的最大那个;无则用基础锚点
-        val (anchor, offset) = activeAnchor(date)
+        // 2. rephaseFlips 中被翻转的当天
+        rephaseFlips.find { it.date == date }?.let { return it.flippedTo }
+        // 3. 找活跃锚点:rephaseFlips 中 rephaseFrom <= 当天 的最大那个;无则用基础锚点
+        val anchor = activeAnchor(date)
         val diff = anchor.daysUntil(date)
         val size = cycle.size
-        val idx = (((diff + offset) % size) + size) % size
+        val idx = ((diff % size) + size) % size
         return cycle[idx]
     }
 
-    private fun activeAnchor(date: LocalDate): Pair<LocalDate, Int> {
-        val applicable = phaseBreaks.filter { it.date <= date }.maxByOrNull { it.date }
-        return if (applicable != null) applicable.date to applicable.cycleOffset
-        else anchorDate to 0
+    private fun activeAnchor(date: LocalDate): LocalDate {
+        return rephaseFlips
+            .filter { it.rephaseFrom <= date }
+            .maxByOrNull { it.rephaseFrom }
+            ?.rephaseFrom
+            ?: anchorDate
     }
 }

core/src/main/kotlin/plus/rua/project/ShiftPatternStorage.kt

@@ -10,9 +10,8 @@ import kotlinx.datetime.LocalDate
  * 编码格式(无 JSON 依赖):
  * - 锚点:ISO 日期串 "2026-07-08"
  * - 周期:逗号分隔的 1/0 串 "1,1,0,0"(1=WORK,0=OFF)
- * - overrides/breaks:逗号分隔的 "日期:值" 对
- *   - overrides 值:1=WORK,0=OFF
- *   - breaks 值:cycleOffset(整数)
+ * - overrides:逗号分隔的 "日期:值" 对,值 1=WORK,0=OFF
+ * - rephaseFlips:逗号分隔的 "翻转日:值:重排起点" 三元组,值 1=WORK,0=OFF
  */
 class ShiftPatternStorage(private val prefs: SharedPreferences) {
 
@@ -20,7 +19,7 @@ class ShiftPatternStorage(private val prefs: SharedPreferences) {
         private const val KEY_ANCHOR = "shift_anchor"
         private const val KEY_CYCLE = "shift_cycle"
         private const val KEY_OVERRIDES = "shift_overrides"
-        private const val KEY_BREAKS = "shift_breaks"
+        private const val KEY_REPHASE = "shift_rephase"
         private const val KEY_NAME = "shift_name"
         private const val SEP = ","
 
@@ -34,13 +33,15 @@ class ShiftPatternStorage(private val prefs: SharedPreferences) {
         val cycleStr = pattern.cycle.joinToString(SEP) { if (it == ShiftKind.WORK) "1" else "0" }
         val overridesStr = pattern.overrides.entries
             .joinToString(SEP) { "${it.key}:${if (it.value == ShiftKind.WORK) 1 else 0}" }
-        val breaksStr = pattern.phaseBreaks
-            .joinToString(SEP) { "${it.date}:${it.cycleOffset}" }
+        val rephaseStr = pattern.rephaseFlips
+            .joinToString(SEP) {
+                "${it.date}:${if (it.flippedTo == ShiftKind.WORK) 1 else 0}:${it.rephaseFrom}"
+            }
         prefs.edit()
             .putString(KEY_ANCHOR, pattern.anchorDate.toString())
             .putString(KEY_CYCLE, cycleStr)
             .putString(KEY_OVERRIDES, overridesStr)
-            .putString(KEY_BREAKS, breaksStr)
+            .putString(KEY_REPHASE, rephaseStr)
             .putString(KEY_NAME, pattern.name)
             .apply()
     }
@@ -56,8 +57,8 @@ class ShiftPatternStorage(private val prefs: SharedPreferences) {
                 cycleStr.split(SEP).map { if (it.trim() == "1") ShiftKind.WORK else ShiftKind.OFF }
             }
             val overrides = parseOverrides(prefs.getString(KEY_OVERRIDES, null))
-            val breaks = parseBreaks(prefs.getString(KEY_BREAKS, null))
-            ShiftPattern(anchor, cycle, overrides, breaks, name = prefs.getString(KEY_NAME, null) ?: "默认")
+            val rephaseFlips = parseRephase(prefs.getString(KEY_REPHASE, null))
+            ShiftPattern(anchor, cycle, overrides, rephaseFlips, name = prefs.getString(KEY_NAME, null) ?: "默认")
         } catch (e: Exception) {
             null
         }
@@ -71,11 +72,16 @@ class ShiftPatternStorage(private val prefs: SharedPreferences) {
         }
     }
 
-    private fun parseBreaks(s: String?): List<PhaseBreak> {
+    private fun parseRephase(s: String?): List<RephaseFlip> {
         if (s.isNullOrBlank()) return emptyList()
-        return s.split(SEP).map { pair ->
-            val parts = pair.split(":")
-            PhaseBreak(LocalDate.parse(parts[0]), parts[1].trim().toInt())
+        return s.split(SEP).map { triple ->
+            // 格式:翻转日:值:重排起点(ISO 日期不含冒号,split 安全)
+            val colonIdx = triple.indexOf(':')
+            val lastColon = triple.lastIndexOf(':')
+            val date = LocalDate.parse(triple.substring(0, colonIdx))
+            val flippedTo = if (triple.substring(colonIdx + 1, lastColon).trim() == "1") ShiftKind.WORK else ShiftKind.OFF
+            val rephaseFrom = LocalDate.parse(triple.substring(lastColon + 1))
+            RephaseFlip(date, flippedTo, rephaseFrom)
         }
     }
 

core/src/main/kotlin/plus/rua/project/ui/ShiftCalendarGrid.kt

@@ -2,14 +2,19 @@ package plus.rua.project.ui
 
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.BoxWithConstraints
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.aspectRatio
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.pager.HorizontalPager
+import androidx.compose.foundation.pager.rememberPagerState
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
@@ -17,33 +22,47 @@ import androidx.compose.material.icons.filled.ChevronLeft
 import androidx.compose.material.icons.filled.ChevronRight
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.DatePicker
+import androidx.compose.material3.DatePickerDialog
+import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.material3.rememberDatePickerState
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clipToBounds
+import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import kotlinx.coroutines.launch
 import kotlinx.datetime.DatePeriod
 import kotlinx.datetime.LocalDate
 import kotlinx.datetime.Month
 import kotlinx.datetime.TimeZone
+import kotlinx.datetime.atStartOfDayIn
 import kotlinx.datetime.isoDayNumber
 import kotlinx.datetime.minus
 import kotlinx.datetime.number
 import kotlinx.datetime.plus
+import kotlinx.datetime.toLocalDateTime
 import kotlinx.datetime.todayIn
+import kotlin.math.abs
 import kotlin.time.Clock
-import plus.rua.project.PhaseBreak
+import kotlin.time.Instant
+import plus.rua.project.RephaseFlip
 import plus.rua.project.ShiftKind
 import plus.rua.project.ShiftPattern
 
@@ -58,7 +77,7 @@ import plus.rua.project.ShiftPattern
  * @param onPatternChange 修改后的新 pattern 回调
  * @param modifier 外部布局修饰符
  */
-@OptIn(ExperimentalFoundationApi::class)
+@OptIn(ExperimentalFoundationApi::class, ExperimentalMaterial3Api::class)
 @Composable
 fun ShiftCalendarGrid(
     pattern: ShiftPattern,
@@ -66,12 +85,20 @@ fun ShiftCalendarGrid(
     modifier: Modifier = Modifier
 ) {
     val today = remember { Clock.System.todayIn(TimeZone.currentSystemDefault()) }
-    var viewYear by remember { mutableStateOf(today.year) }
-    var viewMonth by remember { mutableStateOf(today.month.number) }
+    val initialYear = remember { today.year }
+    val initialMonth = remember { today.month.number }
+    var showMonthPicker by remember { mutableStateOf(false) }
+    val coroutineScope = rememberCoroutineScope()
 
-    val firstOfMonth = LocalDate(viewYear, Month(viewMonth), 1)
-    val daysInMonth = firstOfMonth.plus(DatePeriod(months = 1)).minus(DatePeriod(days = 1)).day
-    val firstWeekdayOffset = firstOfMonth.dayOfWeek.isoDayNumber - 1
+    // Pager 居中无限页,与主日历一致;viewYear/viewMonth 由当前页派生
+    val pagerState = rememberPagerState(initialPage = START_PAGE, pageCount = { Int.MAX_VALUE })
+    val viewYear by remember {
+        derivedStateOf { pageToYearMonth(pagerState.currentPage, initialYear, initialMonth).first }
+    }
+    val viewMonth by remember {
+        derivedStateOf { pageToYearMonth(pagerState.currentPage, initialYear, initialMonth).second }
+    }
+    val density = LocalDensity.current
 
     Card(
         modifier = modifier.fillMaxWidth(),
@@ -86,17 +113,18 @@ fun ShiftCalendarGrid(
                 verticalAlignment = Alignment.CenterVertically
             ) {
                 IconButton(onClick = {
-                    if (viewMonth == 1) { viewMonth = 12; viewYear -= 1 } else viewMonth -= 1
+                    coroutineScope.launch { pagerState.animateScrollToPage(pagerState.currentPage - 1) }
                 }) {
                     Icon(Icons.Filled.ChevronLeft, contentDescription = "上个月")
                 }
                 Text(
                     text = "${viewYear}年 ${viewMonth}月",
                     style = MaterialTheme.typography.titleSmall,
-                    fontWeight = FontWeight.SemiBold
+                    fontWeight = FontWeight.SemiBold,
+                    modifier = Modifier.clickable { showMonthPicker = true }
                 )
                 IconButton(onClick = {
-                    if (viewMonth == 12) { viewMonth = 1; viewYear += 1 } else viewMonth += 1
+                    coroutineScope.launch { pagerState.animateScrollToPage(pagerState.currentPage + 1) }
                 }) {
                     Icon(Icons.Filled.ChevronRight, contentDescription = "下个月")
                 }
@@ -115,34 +143,131 @@ fun ShiftCalendarGrid(
                 }
             }
 
-            (0 until 6).forEach { row ->
-                Row(Modifier.fillMaxWidth()) {
-                    (0 until 7).forEach { col ->
-                        val cellIndex = row * 7 + col
-                        val dayNum = cellIndex - firstWeekdayOffset + 1
-                        if (dayNum in 1..daysInMonth) {
-                            val date = LocalDate(viewYear, Month(viewMonth), dayNum)
-                            ShiftDayCell(
-                                date = date,
-                                pattern = pattern,
-                                onClick = { onPatternChange(toggleOverride(pattern, date)) },
-                                onLongClick = { onPatternChange(toggleFlipAndRephase(pattern, date)) },
-                                modifier = Modifier.weight(1f)
-                            )
+            // 用 BoxWithConstraints 拿宽度,推算行高(格宽=宽/7,aspectRatio(1f) 使行高=格宽)
+            BoxWithConstraints(Modifier.fillMaxWidth()) {
+                val cellWidthPx = constraints.maxWidth / 7
+                val rowHeightPx = cellWidthPx
+
+                // 行数插值:滑动时在当前页与目标页行数间线性过渡,避免高度跳变
+                val interpolatedWeeks by remember {
+                    derivedStateOf {
+                        val fraction = pagerState.currentPageOffsetFraction
+                        if (abs(fraction) > OFFSET_FRACTION_THRESHOLD) {
+                            val cp = pagerState.currentPage
+                            val baseWeeks = calculateWeeksCountForPage(cp, today)
+                            val targetPage = cp + if (fraction > 0) 1 else -1
+                            val targetWeeks = calculateWeeksCountForPage(targetPage, today)
+                            lerp(baseWeeks.toFloat(), targetWeeks.toFloat(), abs(fraction))
                         } else {
-                            Box(Modifier.weight(1f).aspectRatio(1f))
+                            calculateWeeksCountForPage(pagerState.currentPage, today).toFloat()
                         }
                     }
                 }
+                val gridHeightPx = (rowHeightPx * interpolatedWeeks).toInt()
+
+                HorizontalPager(
+                    state = pagerState,
+                    beyondViewportPageCount = 0,
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .height(with(density) { gridHeightPx.toDp() })
+                        .clipToBounds()
+                ) { page ->
+                    val (year, month) = pageToYearMonth(page, initialYear, initialMonth)
+                    MonthGrid(
+                        year = year,
+                        month = month,
+                        pattern = pattern,
+                        onPatternChange = onPatternChange,
+                        modifier = Modifier.fillMaxWidth()
+                    )
+                }
+            }
+        }
+    }
+
+    if (showMonthPicker) {
+        val initialDate = LocalDate(viewYear, Month(viewMonth), 1)
+        val datePickerState = rememberDatePickerState(
+            initialSelectedDateMillis = initialDate.toEpochMillis()
+        )
+        DatePickerDialog(
+            onDismissRequest = { showMonthPicker = false },
+            confirmButton = {
+                TextButton(onClick = {
+                    datePickerState.selectedDateMillis?.let { millis ->
+                        val picked = millis.toLocalDate()
+                        val targetPage = yearMonthToPage(
+                            picked.year, picked.month.number, initialYear, initialMonth
+                        )
+                        coroutineScope.launch { pagerState.animateScrollToPage(targetPage) }
+                    }
+                    showMonthPicker = false
+                }) { Text("确定") }
+            },
+            dismissButton = {
+                TextButton(onClick = { showMonthPicker = false }) { Text("取消") }
+            }
+        ) {
+            DatePicker(state = datePickerState)
+        }
+    }
+}
+
+/**
+ * 迷你月历的单页网格。复用主日历 [getMonthGridInfo] 计算行数与偏移。
+ *
+ * @param year 年
+ * @param month 月(1-12)
+ * @param pattern 当前轮班配置(只读)
+ * @param onPatternChange 修改后的新 pattern 回调
+ * @param modifier 外部布局修饰符
+ */
+@Composable
+private fun MonthGrid(
+    year: Int,
+    month: Int,
+    pattern: ShiftPattern,
+    onPatternChange: (ShiftPattern) -> Unit,
+    modifier: Modifier = Modifier
+) {
+    val gridInfo = remember(year, month) { getMonthGridInfo(year, month) }
+    Column(modifier) {
+        (0 until gridInfo.rows).forEach { row ->
+            Row(Modifier.fillMaxWidth()) {
+                (0 until 7).forEach { col ->
+                    val cellIndex = row * 7 + col
+                    val dayNum = cellIndex - gridInfo.offset + 1
+                    if (dayNum in 1..gridInfo.daysInMonth) {
+                        val date = LocalDate(year, Month(month), dayNum)
+                        ShiftDayCell(
+                            date = date,
+                            pattern = pattern,
+                            onClick = { onPatternChange(toggleOverride(pattern, date)) },
+                            onLongClick = { onPatternChange(toggleFlipAndRephase(pattern, date)) },
+                            modifier = Modifier.weight(1f)
+                        )
+                    } else {
+                        Box(Modifier.weight(1f).aspectRatio(1f))
+                    }
+                }
             }
         }
     }
 }
 
 /**
- * 翻转某天的班/休 override。翻转后若与基础周期值一致,则移除 override。
+ * 翻转某天的班/休(单日 override)。翻转后若与基础周期值一致,则移除 override。
+ *
+ * 若该天存在 rephaseFlip(长按产生的翻转并重排),则移除整个 rephaseFlip,
+ * 避免留下孤立的"幽灵重排"(只清翻转但保留后续相位重排)。
  */
 private fun toggleOverride(pattern: ShiftPattern, date: LocalDate): ShiftPattern {
+    val existingFlip = pattern.rephaseFlips.find { it.date == date }
+    if (existingFlip != null) {
+        // 该天是 rephaseFlip 的翻转日:整体移除,避免幽灵重排
+        return pattern.copy(rephaseFlips = pattern.rephaseFlips - existingFlip)
+    }
     val current = pattern.kindAt(date) ?: return pattern
     val newVal = if (current == ShiftKind.WORK) ShiftKind.OFF else ShiftKind.WORK
     val tempPattern = pattern.copy(overrides = pattern.overrides - date)
@@ -155,35 +280,27 @@ private fun toggleOverride(pattern: ShiftPattern, date: LocalDate): ShiftPattern
 /**
  * 翻转某天的班/休,并从次日起重排周期(后续按 cycle 重新顺延)。
  *
- * 实现:翻转该天 override + 在 [date] 次日插入 PhaseBreak(offset=0)。
+ * 产出原子记录 [RephaseFlip]:翻转该天 + 从次日([rephaseFrom])起重排。
  * 次日成为新的 cycle[0],后续自动按周期顺延。
  *
- * 撤销:再次长按同一天,若存在由该天派生的断点(次日、offset=0),则移除 override 与该断点。
+ * 撤销:再次长按同一天,按 [RephaseFlip.date] 精确匹配并整体移除(不会误删其他记录)。
  *
  * @param date 被翻转并作为重排起点的日期
  */
 private fun toggleFlipAndRephase(pattern: ShiftPattern, date: LocalDate): ShiftPattern {
-    val nextDay = date.plus(DatePeriod(days = 1))
-    val derivedBreak = pattern.phaseBreaks.find { it.date == nextDay && it.cycleOffset == 0 }
-
-    if (derivedBreak != null) {
-        // 撤销:移除该天的 override 与关联断点
-        return pattern.copy(
-            overrides = pattern.overrides - date,
-            phaseBreaks = pattern.phaseBreaks - derivedBreak
-        )
+    val existing = pattern.rephaseFlips.find { it.date == date }
+    if (existing != null) {
+        // 撤销:整体移除该 rephaseFlip(原子删除)
+        return pattern.copy(rephaseFlips = pattern.rephaseFlips - existing)
     }
 
-    // 翻转该天 + 次日插入断点重排
+    // 翻转该天 + 次日重排
     val current = pattern.kindAt(date) ?: return pattern
     val newVal = if (current == ShiftKind.WORK) ShiftKind.OFF else ShiftKind.WORK
-    val tempPattern = pattern.copy(overrides = pattern.overrides - date)
-    val base = tempPattern.kindAt(date)
-    val newOverrides = if (newVal == base) pattern.overrides - date
-                       else pattern.overrides + (date to newVal)
+    val rephaseFrom = date.plus(DatePeriod(days = 1))
     return pattern.copy(
-        overrides = newOverrides,
-        phaseBreaks = pattern.phaseBreaks + PhaseBreak(nextDay, 0)
+        overrides = pattern.overrides - date,  // 该天改由 rephaseFlip 管辖,移除可能的旧 override
+        rephaseFlips = pattern.rephaseFlips + RephaseFlip(date, newVal, rephaseFrom)
     )
 }
 
@@ -206,15 +323,22 @@ private fun ShiftDayCell(
     modifier: Modifier = Modifier
 ) {
     val kind = pattern.kindAt(date)
-    // 断点在"翻转日的次日",表示该天为重排起点
-    val isRephaseStart = pattern.phaseBreaks.any { it.date == date && it.cycleOffset == 0 }
+    // rephaseFlip 的 rephaseFrom = 当天,表示该天为重排起点
+    val isRephaseStart = pattern.rephaseFlips.any { it.rephaseFrom == date }
 
+    // 背景色与文字色配对,保证对比度(对照 DayCell 的配色风格)
     val badgeColor = when {
         isRephaseStart -> MaterialTheme.colorScheme.tertiary
         kind == ShiftKind.WORK -> MaterialTheme.colorScheme.primary
         kind == ShiftKind.OFF -> MaterialTheme.colorScheme.error
         else -> Color.Transparent
     }
+    val badgeTextColor = when {
+        isRephaseStart -> MaterialTheme.colorScheme.onTertiary
+        kind == ShiftKind.WORK -> MaterialTheme.colorScheme.onPrimary
+        kind == ShiftKind.OFF -> MaterialTheme.colorScheme.onError
+        else -> Color.Transparent
+    }
     val badgeText = when {
         isRephaseStart -> "起"
         kind == ShiftKind.WORK -> "班"
@@ -243,7 +367,7 @@ private fun ShiftDayCell(
             ) {
                 Text(
                     text = badgeText,
-                    color = MaterialTheme.colorScheme.onPrimary,
+                    color = badgeTextColor,
                     fontSize = 8.sp,
                     fontWeight = FontWeight.Bold,
                     lineHeight = 8.sp
@@ -252,3 +376,9 @@ private fun ShiftDayCell(
         }
     }
 }
+
+private fun LocalDate.toEpochMillis(): Long =
+    this.atStartOfDayIn(TimeZone.UTC).toEpochMilliseconds()
+
+private fun Long.toLocalDate(): LocalDate =
+    Instant.fromEpochMilliseconds(this).toLocalDateTime(TimeZone.UTC).date

core/src/main/kotlin/plus/rua/project/ui/ShiftPatternScreen.kt

@@ -1,5 +1,6 @@
 package plus.rua.project.ui
 
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.ExperimentalLayoutApi
@@ -13,7 +14,6 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ChevronLeft
-import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.DatePicker
@@ -25,6 +25,10 @@ import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarDuration
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
+import androidx.compose.material3.SnackbarResult
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.material3.TopAppBar
@@ -34,6 +38,7 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -42,6 +47,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import kotlinx.datetime.LocalDate
 import kotlinx.datetime.TimeZone
+import kotlinx.coroutines.launch
 import kotlinx.datetime.atStartOfDayIn
 import kotlinx.datetime.toLocalDateTime
 import plus.rua.project.CalendarViewModel
@@ -73,7 +79,8 @@ fun ShiftPatternScreen(onBack: () -> Unit) {
     LaunchedEffect(pattern) { storage.save(pattern) }
 
     var showAnchorPicker by remember { mutableStateOf(false) }
-    var showResetDialog by remember { mutableStateOf(false) }
+    val snackbarHostState = remember { SnackbarHostState() }
+    val scope = rememberCoroutineScope()
 
     Scaffold(
         topBar = {
@@ -85,14 +92,15 @@ fun ShiftPatternScreen(onBack: () -> Unit) {
                     }
                 }
             )
-        }
+        },
+        snackbarHost = { SnackbarHost(hostState = snackbarHostState) }
     ) { padding ->
         Column(
             modifier = Modifier
                 .fillMaxSize()
                 .padding(padding)
                 .verticalScroll(rememberScrollState())
-                .padding(horizontal = 16.dp, vertical = 8.dp),
+                .padding(horizontal = 16.dp),
             verticalArrangement = Arrangement.spacedBy(16.dp)
         ) {
             Text("基础周期", style = MaterialTheme.typography.titleSmall, fontWeight = FontWeight.SemiBold)
@@ -110,9 +118,12 @@ fun ShiftPatternScreen(onBack: () -> Unit) {
                         verticalAlignment = Alignment.CenterVertically
                     ) {
                         Text("锚点日期", style = MaterialTheme.typography.bodyMedium)
-                        TextButton(onClick = { showAnchorPicker = true }) {
-                            Text(pattern.anchorDate.toString())
-                        }
+                        Text(
+                            text = pattern.anchorDate.toString(),
+                            style = MaterialTheme.typography.bodyMedium,
+                            color = MaterialTheme.colorScheme.primary,
+                            modifier = Modifier.clickable { showAnchorPicker = true }
+                        )
                     }
                     Row(
                         modifier = Modifier.fillMaxWidth(),
@@ -145,7 +156,7 @@ fun ShiftPatternScreen(onBack: () -> Unit) {
                             pattern = pattern.copy(
                                 cycle = cycle,
                                 overrides = emptyMap(),
-                                phaseBreaks = emptyList()
+                                rephaseFlips = emptyList()
                             )
                         },
                         label = { Text(label) }
@@ -167,7 +178,20 @@ fun ShiftPatternScreen(onBack: () -> Unit) {
             )
 
             OutlinedButton(
-                onClick = { showResetDialog = true },
+                onClick = {
+                    val previous = pattern
+                    pattern = CalendarViewModel.DEFAULT_PATTERN
+                    scope.launch {
+                        val result = snackbarHostState.showSnackbar(
+                            message = "已恢复默认设置",
+                            actionLabel = "撤销",
+                            duration = SnackbarDuration.Short
+                        )
+                        if (result == SnackbarResult.ActionPerformed) {
+                            pattern = previous
+                        }
+                    }
+                },
                 modifier = Modifier.fillMaxWidth()
             ) {
                 Text("恢复默认")
@@ -194,23 +218,6 @@ fun ShiftPatternScreen(onBack: () -> Unit) {
             DatePicker(state = state)
         }
     }
-
-    if (showResetDialog) {
-        AlertDialog(
-            onDismissRequest = { showResetDialog = false },
-            title = { Text("恢复默认") },
-            text = { Text("将清空所有调班与断点设置,恢复为 2 班 2 休。确认?") },
-            confirmButton = {
-                TextButton(onClick = {
-                    pattern = CalendarViewModel.DEFAULT_PATTERN
-                    showResetDialog = false
-                }) { Text("确定") }
-            },
-            dismissButton = {
-                TextButton(onClick = { showResetDialog = false }) { Text("取消") }
-            }
-        )
-    }
 }
 
 private fun LocalDate.toEpochMillis(): Long =

core/src/test/kotlin/plus/rua/project/ShiftPatternStorageTest.kt

@@ -39,7 +39,7 @@ class ShiftPatternStorageTest {
                 LocalDate(2026, 7, 12) to ShiftKind.OFF,
                 LocalDate(2026, 7, 14) to ShiftKind.WORK
             ),
-            phaseBreaks = listOf(PhaseBreak(LocalDate(2026, 7, 18), 0))
+            rephaseFlips = listOf(RephaseFlip(LocalDate(2026, 7, 17), ShiftKind.OFF, LocalDate(2026, 7, 18)))
         )
         storage.save(pattern)
         val result = storage.load()
@@ -53,7 +53,7 @@ class ShiftPatternStorageTest {
             anchorDate = LocalDate(2026, 5, 15),
             cycle = listOf(ShiftKind.WORK, ShiftKind.OFF),
             overrides = emptyMap(),
-            phaseBreaks = emptyList()
+            rephaseFlips = emptyList()
         )
         storage.save(pattern)
         assertEquals(pattern, storage.load())

core/src/test/kotlin/plus/rua/project/ShiftPatternTest.kt

@@ -199,75 +199,66 @@ class ShiftPatternTest {
         assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 17)))
     }
 
-    // ---- kindAt: 相位断点 phaseBreak ----
+    // ---- kindAt: 翻转并重排 rephaseFlip ----
 
     @Test
-    fun kindAt_phaseBreak_restartsCycleFromBreakDate() {
-        // 断点设在 5/19,从这天起重新 cycle[0]
+    fun kindAt_rephaseFlip_restartsCycleFromRephaseDate() {
+        // 5/18 翻转为 OFF,5/19 起重排(rephaseFrom=5/19)
         val pattern = twoOnTwoOff.copy(
-            phaseBreaks = listOf(PhaseBreak(LocalDate(2026, 5, 19), 0))
+            rephaseFlips = listOf(RephaseFlip(LocalDate(2026, 5, 18), ShiftKind.OFF, LocalDate(2026, 5, 19)))
         )
-        // 5/19 = cycle[0] = WORK
+        // 5/18 = 翻转为 OFF
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 5, 18)))
+        // 5/19 = cycle[0] = WORK(重排起点)
         assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 19)))
         // 5/20 = cycle[1] = WORK
         assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 20)))
         // 5/21 = cycle[2] = OFF
         assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 5, 21)))
-        // 断点之前保持原相位:5/18 = (18-15)%4=3 = OFF
-        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 5, 18)))
     }
 
     @Test
-    fun kindAt_phaseBreakWithOffset_shiftsPhase() {
-        // 断点 5/19,cycleOffset=2:5/19 对应 cycle[2]=OFF(而非 cycle[0]=WORK)
+    fun kindAt_multipleRephaseFlips_usesLatestApplicable() {
+        // 两个 rephaseFlip:5/18→5/19 重排,5/24→5/25 重排
         val pattern = twoOnTwoOff.copy(
-            phaseBreaks = listOf(PhaseBreak(LocalDate(2026, 5, 19), 2))
-        )
-        // 5/19 = cycle[(0+2)%4] = cycle[2] = OFF
-        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 5, 19)))
-        // 5/20 = cycle[(1+2)%4] = cycle[3] = OFF
-        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 5, 20)))
-        // 5/21 = cycle[(2+2)%4] = cycle[0] = WORK
-        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 21)))
-    }
-
-    @Test
-    fun kindAt_multiplePhaseBreaks_usesLatestApplicable() {
-        // 两个断点:5/19(offset 0) 和 5/25(offset 1)
-        val pattern = twoOnTwoOff.copy(
-            phaseBreaks = listOf(
-                PhaseBreak(LocalDate(2026, 5, 19), 0),
-                PhaseBreak(LocalDate(2026, 5, 25), 1)
+            rephaseFlips = listOf(
+                RephaseFlip(LocalDate(2026, 5, 18), ShiftKind.OFF, LocalDate(2026, 5, 19)),
+                RephaseFlip(LocalDate(2026, 5, 24), ShiftKind.OFF, LocalDate(2026, 5, 25))
             )
         )
-        // 5/19-5/24 受第一个断点支配(offset 0)
+        // 5/19-5/23 受第一个重排支配(5/19 起锚)
         // 5/19 = cycle[0] = WORK
         assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 19)))
-        // 5/24 = cycle[(5)%4] = cycle[1] = WORK
-        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 24)))
-        // 5/25 起受第二个断点支配(offset 1)
-        // 5/25 = cycle[(0+1)%4] = cycle[1] = WORK
+        // 5/23 = cycle[(4)%4] = cycle[0] = WORK
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 23)))
+        // 5/24 = 第二个 rephaseFlip 的翻转日,翻转为 OFF
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 5, 24)))
+        // 5/25 起受第二个断点支配(5/25 起锚)
+        // 5/25 = cycle[0] = WORK
         assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 25)))
-        // 5/26 = cycle[(1+1)%4] = cycle[2] = OFF
-        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 5, 26)))
+        // 5/26 = cycle[1] = WORK
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 5, 26)))
+        // 5/27 = cycle[2] = OFF
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 5, 27)))
     }
 
-    // ---- kindAt: override + phaseBreak 组合(用户原始例子)----
+    // ---- kindAt: override + rephaseFlip 组合(用户原始例子)----
 
     @Test
-    fun kindAt_userExample_combinedOverridesAndPhaseBreak() {
+    fun kindAt_userExample_combinedOverridesAndRephaseFlip() {
         // 基础锚点 7/8,周期 [WORK,WORK,OFF,OFF]
         val pattern = ShiftPattern(
             anchorDate = LocalDate(2026, 7, 8),
             cycle = listOf(ShiftKind.WORK, ShiftKind.WORK, ShiftKind.OFF, ShiftKind.OFF),
             overrides = mapOf(
-                LocalDate(2026, 7, 12) to ShiftKind.OFF,  // 班→休
-                LocalDate(2026, 7, 14) to ShiftKind.WORK, // 休→班
-                LocalDate(2026, 7, 15) to ShiftKind.WORK, // 休→班
-                LocalDate(2026, 7, 16) to ShiftKind.OFF,  // 班→休
-                LocalDate(2026, 7, 17) to ShiftKind.OFF   // 班→休
+                LocalDate(2026, 7, 12) to ShiftKind.OFF,  // 班→休(单日)
+                LocalDate(2026, 7, 14) to ShiftKind.WORK, // 休→班(单日)
+                LocalDate(2026, 7, 15) to ShiftKind.WORK, // 休→班(单日)
+                LocalDate(2026, 7, 16) to ShiftKind.OFF,  // 班→休(单日)
+                LocalDate(2026, 7, 17) to ShiftKind.OFF   // 班→休(单日)
             ),
-            phaseBreaks = listOf(PhaseBreak(LocalDate(2026, 7, 18), 0))
+            // 7/17 翻转为 OFF,7/18 起重排
+            rephaseFlips = listOf(RephaseFlip(LocalDate(2026, 7, 17), ShiftKind.OFF, LocalDate(2026, 7, 18)))
         )
         // 7/10,11 = 基础周期自动算 (idx 2,3) = OFF,OFF
         assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 10)))
@@ -279,13 +270,86 @@ class ShiftPatternTest {
         // 7/14,15 = override WORK
         assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 7, 14)))
         assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 7, 15)))
-        // 7/16,17 = override OFF
+        // 7/16 = override OFF
         assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 16)))
+        // 7/17 = rephaseFlip 翻转为 OFF
         assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 17)))
-        // 7/18 起 phaseBreak 重排:cycle[0,1,2,3] = WORK,WORK,OFF,OFF
+        // 7/18 起 rephase 重排:cycle[0,1,2,3] = WORK,WORK,OFF,OFF
         assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 7, 18)))
         assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 7, 19)))
         assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 20)))
         assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 21)))
     }
+
+    // ---- 长按"翻转并重排"场景(RephaseFlip 原子操作)----
+
+    /**
+     * 单次长按:锚点 7/10,2班2休。长按 7/10 把班翻转为休,7/11 起重排。
+     * 期望:7/10=休,7/11-12=班,7/13-14=休(后续按 cycle 顺延)
+     */
+    @Test
+    fun longPress_singleFlip_dateFlippedAndRephased() {
+        val pattern = ShiftPattern(
+            anchorDate = LocalDate(2026, 7, 10),
+            cycle = listOf(ShiftKind.WORK, ShiftKind.WORK, ShiftKind.OFF, ShiftKind.OFF),
+            rephaseFlips = listOf(RephaseFlip(LocalDate(2026, 7, 10), ShiftKind.OFF, LocalDate(2026, 7, 11)))
+        )
+        // 7/10 翻转为休
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 10)))
+        // 7/11 起重排:cycle[0,1]=班班
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 7, 11)))
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 7, 12)))
+        // cycle[2,3]=休休
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 13)))
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 14)))
+        // 继续循环:7/15=cycle[0]=班
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 7, 15)))
+    }
+
+    /**
+     * 连续两次长按:7/10 一次、7/14 一次。两个 rephaseFlip 共存。
+     * 期望:7/11-13 受第一个重排支配,7/15 起受第二个重排支配
+     */
+    @Test
+    fun longPress_twoFlips_bothRephasesApplied() {
+        val pattern = ShiftPattern(
+            anchorDate = LocalDate(2026, 7, 10),
+            cycle = listOf(ShiftKind.WORK, ShiftKind.WORK, ShiftKind.OFF, ShiftKind.OFF),
+            rephaseFlips = listOf(
+                RephaseFlip(LocalDate(2026, 7, 10), ShiftKind.OFF, LocalDate(2026, 7, 11)),
+                RephaseFlip(LocalDate(2026, 7, 14), ShiftKind.OFF, LocalDate(2026, 7, 15))
+            )
+        )
+        // 7/10 翻转为休
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 10)))
+        // 7/11-13 受第一个重排(7/11 起):班班休
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 7, 11)))
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 7, 12)))
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 13)))
+        // 7/14 翻转为休
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 14)))
+        // 7/15 起受第二个重排:班班休休
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 7, 15)))
+        assertEquals(ShiftKind.WORK, pattern.kindAt(LocalDate(2026, 7, 16)))
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 17)))
+        assertEquals(ShiftKind.OFF, pattern.kindAt(LocalDate(2026, 7, 18)))
+    }
+
+    /**
+     * 撤销长按:移除整个 RephaseFlip 后,回到基础周期。
+     */
+    @Test
+    fun longPress_undo_returnsToBaseCycle() {
+        val before = ShiftPattern(
+            anchorDate = LocalDate(2026, 7, 10),
+            cycle = listOf(ShiftKind.WORK, ShiftKind.WORK, ShiftKind.OFF, ShiftKind.OFF),
+            rephaseFlips = listOf(RephaseFlip(LocalDate(2026, 7, 10), ShiftKind.OFF, LocalDate(2026, 7, 11)))
+        )
+        // 撤销:移除整个 rephaseFlip(原子删除,不会留孤立断点)
+        val after = before.copy(rephaseFlips = emptyList())
+        // 回到基础:7/10=班(锚点),7/12=休
+        assertEquals(ShiftKind.WORK, after.kindAt(LocalDate(2026, 7, 10)))
+        assertEquals(ShiftKind.WORK, after.kindAt(LocalDate(2026, 7, 11)))
+        assertEquals(ShiftKind.OFF, after.kindAt(LocalDate(2026, 7, 12)))
+    }
 }